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Sam Wyly did something similar, set $100,000 per annum for a law firm to slowly destroy Ma Bell. http://www.charlesandsamwyly.com/sam-wyly-highway-computers.... More about it in his book (which is outstanding for any business read). http://www.1000dollarsandanidea.com/

I'm pretty sure that the number of patents you could get revoked with $2.5 billion in legal effort is much smaller than the total number of potentially problematic patents. Unfortunatly fighting bad patents is a classic public good [1] which means its hard to coordinate people on making them.

If your feeling altruistic, however, the EFF is working to help get some particularly egregious examples revoked. [2] I've donated to them and I encourage others to do the same.

[1] http://en.wikipedia.org/wiki/Public_good

[2] https://w2.eff.org/patent/

Do you know he's not doing those?

I have no idea about the lobbying, but the article seems to suggest that he is just paying increasing insurance and settlement costs instead.